/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Calibration/Tools/plugins/SingleEleCalibSelector.cc

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// my includes
#include "CommonTools/UtilAlgos/interface/ParameterAdapter.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/Event.h"

// Geometry
#include "Geometry/CaloEventSetup/interface/CaloTopologyRecord.h"
#include "Geometry/CaloGeometry/interface/CaloGeometry.h"
#include "Geometry/CaloTopology/interface/CaloSubdetectorTopology.h"

#include "DataFormats/EgammaCandidates/interface/GsfElectron.h"
#include "DataFormats/EgammaCandidates/interface/GsfElectronFwd.h"

#include "DataFormats/EcalRecHit/interface/EcalRecHitCollections.h"
#include "DataFormats/DetId/interface/DetId.h"
#include "DataFormats/EcalDetId/interface/EBDetId.h"
#include "DataFormats/EcalDetId/interface/EEDetId.h"


#include "Calibration/Tools/plugins/SingleEleCalibSelector.h"

//CLHEP
#include <CLHEP/Vector/LorentzVector.h>

#include <iostream>

SingleEleCalibSelector::SingleEleCalibSelector (const edm::ParameterSet& iConfig)
 {
   ESCOPinMin_      = iConfig.getParameter<double>("ESCOPinMin");
   ESCOPinMax_      = iConfig.getParameter<double>("ESCOPinMax");
   ESeedOPoutMin_   = iConfig.getParameter<double>("ESeedOPoutMin");
   ESeedOPoutMax_   = iConfig.getParameter<double>("ESeedOPoutMax");  
   PinMPoutOPinMin_ = iConfig.getParameter<double>("PinMPoutOPinMin");
   PinMPoutOPinMax_ = iConfig.getParameter<double>("PinMPoutOPinMax");   
   E5x5OPoutMin_    = iConfig.getParameter<double>("E5x5OPoutMin");
   E5x5OPoutMax_    = iConfig.getParameter<double>("E5x5OPoutMax");
   E3x3OPinMin_     = iConfig.getParameter<double>("E3x3OPinMin");
   E3x3OPinMax_     = iConfig.getParameter<double>("E3x3OPinMax");
   E3x3OE5x5Min_    = iConfig.getParameter<double>("E3x3OE5x5Min");
   E3x3OE5x5Max_    = iConfig.getParameter<double>("E3x3OE5x5Max"); 
   EBrecHitLabel_   = iConfig.getParameter<edm::InputTag> ("alcaBarrelHitCollection"); 
   EErecHitLabel_   = iConfig.getParameter<edm::InputTag> ("alcaEndcapHitCollection"); 
 }


// ------------------------------------------------------------


void 

SingleEleCalibSelector::select (edm::Handle<collection> inputHandle, 
                        const edm::Event& iEvent , const edm::EventSetup& iSetup) 
{
  selected_.clear();

  //Get the EB rechit collection
  edm::Handle<EBRecHitCollection> barrelRecHitsHandle ;
  iEvent.getByLabel (EBrecHitLabel_, barrelRecHitsHandle) ;
  const EBRecHitCollection* EBHitsColl = barrelRecHitsHandle.product () ; 

  //Get the EE rechit collection
  edm::Handle<EERecHitCollection> endcapRecHitsHandle ;
  iEvent.getByLabel (EErecHitLabel_, endcapRecHitsHandle) ;
  const EERecHitCollection* EEHitsColl = endcapRecHitsHandle.product () ; 
  
  //To deal with Geometry
  iSetup.get<CaloTopologyRecord>().get(theCaloTopology); 

  //Loop over electrons
  for( collection::const_iterator ele = (*inputHandle).begin(); ele != (*inputHandle).end(); ++ ele ){
     
    //Find DetID max hit
    DetId maxHitId = findMaxHit((*ele).superCluster()->hitsAndFractions(),EBHitsColl,EEHitsColl);
    
    if(maxHitId.null()){std::cout<<" Null Id"<<std::endl; continue;}

    // Find 3x3 and 5x5 windows around xtal max and compute E3x3,E5x5
    double E5x5 = 0.; 
    double E3x3 = 0.; 
  
    const CaloSubdetectorTopology* topology = theCaloTopology->getSubdetectorTopology(DetId::Ecal,maxHitId.subdetId()); 
    int WindowSize = 5;
    std::vector<DetId> m5x5aroundMax = topology->getWindow(maxHitId,WindowSize,WindowSize); 
    E5x5 = EnergyNxN(m5x5aroundMax,EBHitsColl,EEHitsColl);
    WindowSize = 3;
    std::vector<DetId> m3x3aroundMax = topology->getWindow(maxHitId,WindowSize,WindowSize); 
    E3x3 = EnergyNxN(m3x3aroundMax,EBHitsColl,EEHitsColl);

    double pin = ele->trackMomentumAtVtx ().R () ;
    double piMpoOpi = (pin - ele->trackMomentumOut ().R ()) / pin ;
    double E5x5OPout = E5x5/ele->trackMomentumOut ().R () ;
    double E3x3OPin = E3x3/pin;
    double E3x3OE5x5 = E3x3/E5x5;
    double EseedOPout = ele->eSeedClusterOverPout () ;
    double EoPin = ele->eSuperClusterOverP () ;      
  
    if ( piMpoOpi > PinMPoutOPinMin_ && piMpoOpi < PinMPoutOPinMax_ && 
         EseedOPout > ESeedOPoutMin_ && EseedOPout < ESeedOPoutMax_ &&
         EoPin > ESCOPinMin_ && EoPin < ESCOPinMax_ &&
         E5x5OPout > E5x5OPoutMin_ && E5x5OPout < E5x5OPoutMax_ && 
         E3x3OPin > E3x3OPinMin_ && E3x3OPin < E3x3OPinMax_ &&
         E3x3OE5x5 > E3x3OE5x5Min_ && E3x3OE5x5 < E3x3OE5x5Max_)
      {
        selected_.push_back( & (*ele) );
      }
  }
   
  return ;
}       


// ------------------------------------------------------------


SingleEleCalibSelector::~SingleEleCalibSelector()
{}


// ------------------------------------------------------------


// To find Max Hit
DetId SingleEleCalibSelector::findMaxHit(const std::vector<std::pair<DetId,float> > & v1,
                                const EBRecHitCollection* EBhits,
                                const EERecHitCollection* EEhits) 
{
  double currEnergy = 0. ;
  DetId maxHit ;
  for (std::vector<std::pair<DetId,float> >::const_iterator idsIt = v1.begin () ; 
       idsIt != v1.end () ; ++idsIt)
    {
      if (idsIt->first.subdetId () == EcalBarrel) 
        {              
          EBRecHitCollection::const_iterator itrechit ;
          itrechit = EBhits->find ((*idsIt).first) ;
          if (itrechit == EBhits->end () )
            {
              edm::LogInfo ("reading") << "[findMaxHit] rechit not found! " ;
              continue ;
            }
//FIXME: use fraction ??
          if (itrechit->energy () > currEnergy)
            {
              currEnergy = itrechit->energy () ;
              maxHit= (*idsIt).first ;
            }
        }
      else 
        {     
          EERecHitCollection::const_iterator itrechit ;
          itrechit = EEhits->find ((*idsIt).first) ;
          if (itrechit == EEhits->end () )
            {
              edm::LogInfo ("reading")<< "[findMaxHit] rechit not found! " ;
              continue ;
            }
          
          if (itrechit->energy () > currEnergy)
            {
              currEnergy=itrechit->energy () ;
              maxHit= (*idsIt).first ;
            }
        }
    }
  return maxHit ;
}


// Energy in a window NxN
double SingleEleCalibSelector::EnergyNxN(const std::vector<DetId> & vNxN, 
                                   const EBRecHitCollection* EBhits,
                                   const EERecHitCollection* EEhits)
{
  double dummy = 0.;
  int window_size = vNxN.size(); 
  for (int ixtal = 0; ixtal < window_size; ixtal++){ 
    if (vNxN[ixtal].subdetId() == EcalBarrel) 
      { 
        EBRecHitCollection::const_iterator it_rechit; 
        it_rechit = EBhits->find(vNxN[ixtal]);
        dummy+= it_rechit->energy(); 
      } 
    else 
      { 
        EERecHitCollection::const_iterator it_rechit;
        it_rechit = EEhits->find(vNxN[ixtal]); 
        dummy+= it_rechit->energy(); 
      } 
  }
  
  return dummy;
}